body {
	background-color: gainsboro;
	width: 100%;
	font-size: 2vh;
	font-weight: 900;
}

/* 顶部栏 */
#top {
	width: 100%;
	height: 8vh;
	background-color: white;
	font-size: 2vb;
	position: relative;
	/* 把div内的子元素都设置成垂直居中 */
	display: flex;
	align-items: center;
	justify-content: center;
	/* 只对div内的文字有效,水平居中 */
	font-size: 3vb;
	font-weight: bold;
	margin-bottom: 0.5vh;
}

#centen {
	width: 100%;
	height: 35vh;
	background-color: white;
	margin-top: 2%;
	border-radius: 5%;
	padding: 2vh;
}

#activty_img {
	width: 100%;
	height: 25vh;
}

#activity_box {
	width: 80%;
	height: 5vh;
	float: left;
	/* margin-top: 1vh; */

}

#activity_box_time {
	margin-top: 1vh;
}

#activity_box_ing {
	margin-top: 1vh;
	'

}

#activity_time {
	font-size: 1.5vh;
	color: darkgray;
}

#activity_button {
	color: royalblue;
	font-size: 2vh;
	border-style: none;
}